Keep different exercises and equipment setups identifiable in your log.
Name the movement
Use a consistent name for the exercise you perform. Give a distinct variation its own identity instead of silently mixing it into an older record.
Record the setup
A cable machine and another machine with the same displayed weight need not provide equivalent resistance. Use a short setup note to explain a change.
Inspect the underlying sets
A chart summarizes entries. Look at the weight, repetitions and notes behind a change before treating it as improved or reduced performance.